IB not much (most of them only 4400=newest batchs up to 4700 MHz average), SB is better for air/WC OC
but you need add +200MHz to match performance of IB. I have 2 SB stable 4.8 and 4.9 and one fx 8150 stable 4.8Ghz. I can forget about the 5GHz on two platforms 24/7.
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